You disperse into pure Shadow energy, reducing all damage taken by 90%. You are unable to attack or cast spells, but you regenerate 6% mana every 1 sec for 6 seconds.

Dispersion can be cast while stunned, feared or silenced and clears all snare and movement impairing effects when cast, and makes you immune to them while dispersed.

Dispersion is a priest ability learned at level 60 for those with the Shadow specialization. Dispersion protects the priest by reducing damage taken by 90% for six sec. The priest will regenerate 6% mana every second up to 36% of mana total. Due to its relatively short cooldown and free cast, Dispersion is an excellent regeneration spell. Dispersion can be cast while stunned, feared or silenced, which makes it very useful in PvP as well.

It has many uses in PvE besides just regenerating mana; can also be used to soak large (AoE) hits that would kill even a well-geared tank.